Book/Dissertation / PhD Thesis

FZJ-2023-02233

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Sustainable Fabrication of Ceramic Solid Electrolytes for Solid-State Lithium Batteries

Ye, R. (Corresponding author)FZJ*

2023
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich
ISBN: 978-3-95806-694-6

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Please use a persistent id in citations: doi:10.34734/FZJ-2023-02233

Abstract: Solid-state lithium batteries (SSLBs) are considered to be one of the most promising nextgeneration Li batteries due to their high capacity and intrinsic safety. Their sustainable processing offers additional advantages over conventional batteries in terms of ecological and economicbenefits. However, the sustainable processing of SSLBs has been only sporadically investigated and need to be optimized. Garnet-type Li7La3Zr2O12 (LLZO) is one representative of oxide-based solid electrolytes (SE) for SSLBs. A thin freestanding LLZO sheet can be fabricated by tape-casting and used e.g. as separator in SSLBs, since tape-casting is an industrially established process and enables large-scale production of such SEs. However, organic solvents and additives employed in conventional slurry recipes for tape-casting give rise to health and safety concerns and additionally cause high cost for solvent recovery. Hence, development of a water-based processing route reduces both manufacturing costs and environmental footprint. In this work, a tape-casting process for LLZO SEs is developed using water as solvent, the watersolublebiopolymer as binder and other harmless polymers as plasticizers. During the aqueous processing, a Li+/H+ exchange takes place, but this Li+/H+ exchange reaction is reversible in the procedure and results in the formation of stoichiometric cubic LLZO at the end. The obtained freestanding LLZO thin sheets have a relative density of 90% to the theoretical density and exhibit an ionic conductivity of 0.15 mS cm-1 at room temperature.

Note: Dissertation, RWTH Aachen University, 2023

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)

Research Program(s):

1. 899 - ohne Topic (POF4-899) (POF4-899)

Appears in the scientific report 2023

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Database coverage:
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